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\frac{3x^{3}-8x}{6}
Factor out \frac{1}{6}.
x\left(3x^{2}-8\right)
Consider 3x^{3}-8x. Factor out x.
\frac{x\left(3x^{2}-8\right)}{6}
Rewrite the complete factored expression. Polynomial 3x^{2}-8 is not factored since it does not have any rational roots.
\frac{3x^{3}}{6}-\frac{2\times 4x}{6}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 2 and 3 is 6. Multiply \frac{x^{3}}{2} times \frac{3}{3}. Multiply \frac{4x}{3} times \frac{2}{2}.
\frac{3x^{3}-2\times 4x}{6}
Since \frac{3x^{3}}{6} and \frac{2\times 4x}{6} have the same denominator, subtract them by subtracting their numerators.
\frac{3x^{3}-8x}{6}
Do the multiplications in 3x^{3}-2\times 4x.